Martin-Green makes history as the first African-American woman to lead the cast of one of the franchise's ensembles.

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File photo of actress Sonequa Martin-Green attends the premiere of AMC's "Fear The Walking Dead" Season 2 at Cinemark Playa Vista on March 29, 2016 in Los Angeles, California.

Sonequa Martin-Green, known well by fans of genre TV thanks to her work on The Walking Dead, has been tapped to star in the first Trek series in a decade. She'll play a lieutenant commander on the Discovery, according to EW, who first reported the news.

Martin-Green makes history as the first African-American woman to lead the cast of one of the franchise's ensembles. Not only that, but Discovery marks another first by making its main protagonist someone other than a captain—something that was important to then-executive producer Bryan Fuller when he spoke about the series with reporters back in August.

The 13-episode first season, which will be made available weekly on CBS All Access following a two-hour launch on CBS in May, will follow an incident in the history of Starfleet that other series/movies in the franchise have touched upon, but never actually explored.

Martin-Green's involvement in the show is sure to have fans wondering about the fate of her character on TWD, Sasha, who is still very much alive. However, per EW, she will continue on as a series regular on the hit AMC series. CBS TV Studios declined to comment on her casting.